<template>
  <!-- 商品分类导航 -->
  <div class="type-nav">
    <div class="container">
      <div @mouseleave="isHidden">
        <h2 class="all" @mouseenter="isShow">全部商品分类</h2>
        <transition name="sort">
          <div class="sort" v-show="flag">
            <div class="all-sort-list2" @mouseleave="cateId = null">
              <div class="item" :class="{ active: cateId === item.categoryId }" @mouseenter="enterFlag(item.categoryId)" @click="goSearch($event)" v-for="item in sortList" :key="item.categoryId">
                <h3>
                  <a :data-category-name="item.categoryName" :data-category1-id="item.categoryId">{{ item.categoryName }}</a>
                </h3>
                <div class="item-list clearfix">
                  <div class="subitem">
                    <dl class="fore" v-for="item2 in item.categoryChild" :key="item2.categoryId">
                      <dt>
                        <a :data-category-name="item2.categoryName" :data-category2-id="item.categoryId">{{ item2.categoryName }}</a>
                      </dt>
                      <dd>
                        <em v-for="item3 in item2.categoryChild" :key="item3.categoryId">
                          <a :data-category-name="item3.categoryName" :data-category3-id="item.categoryId">{{ item3.categoryName }}</a>
                        </em>
                      </dd>
                    </dl>
                  </div>
                </div>
              </div>
            </div>
          </div>
        </transition>
      </div>

      <nav class="nav">
        <a href="###">服装城</a>
        <a href="###">美妆馆</a>
        <a href="###">智品汇超市</a>
        <a href="###">全球购</a>
        <a href="###">闪购</a>
        <a href="###">团购</a>
        <a href="###">有趣</a>
        <a href="###">秒杀</a>
      </nav>
    </div>
  </div>
</template>

<script>
import { mapState } from 'vuex'
import _ from 'lodash'
export default {
  name: 'TypeNav',
  data() {
    return {
      cateId: null,
      flag: false,
    }
  },
  // 从home模块拿取state中的navList数组
  // 一次发起请求，跳转页面时不用重新发起请求
  computed: {
    ...mapState('home', { sortList: 'navList' }),
    isHome() {
      return this.$route.path === '/home'
    },
  },
  methods: {
    enterFlag: _.throttle(function (id) {
      this.cateId = id
    }, 200),
    goSearch(e) {
      const { categoryName, category1Id, category2Id, category3Id } = e.target.dataset
      // 点击空白处退出
      if (!categoryName) return
      // query参数为undefined时，不会传该参数
      this.$router.push({ name: 'search', query: { categoryName, category1Id, category2Id, category3Id }, params: this.$route.params })
    },
    isShow() {
      this.flag = true
    },
    isHidden() {
      if (this.isHome) return
      this.flag = false
    },
  },
  mounted() {
    this.flag = this.isHome
  },
}
</script>

<style lang="scss" scoped>
.type-nav {
  border-bottom: 2px solid #e1251b;

  .container {
    width: 1200px;
    margin: 0 auto;
    display: flex;
    position: relative;

    .all {
      width: 210px;
      height: 45px;
      background-color: #e1251b;
      line-height: 45px;
      text-align: center;
      color: #fff;
      font-size: 14px;
      font-weight: bold;
    }

    .nav {
      a {
        height: 45px;
        margin: 0 22px;
        line-height: 45px;
        font-size: 16px;
        color: #333;
      }
    }

    .sort {
      position: absolute;
      left: 0;
      top: 45px;
      width: 210px;
      position: absolute;
      background: #fafafa;
      z-index: 999;

      .all-sort-list2 {
        .item {
          // &:hover {
          //   background-color: pink;
          // }
          h3 {
            line-height: 30px;
            font-size: 14px;
            font-weight: 400;
            overflow: hidden;
            padding: 0 20px;
            margin: 0;

            a {
              color: #333;
            }
          }

          .item-list {
            display: none;
            position: absolute;
            width: 734px;
            min-height: 460px;
            background: #f7f7f7;
            left: 210px;
            border: 1px solid #ddd;
            top: 0;
            z-index: 9999 !important;

            .subitem {
              float: left;
              width: 650px;
              padding: 0 4px 0 8px;

              dl {
                border-top: 1px solid #eee;
                padding: 6px 0;
                overflow: hidden;
                zoom: 1;

                &.fore {
                  border-top: 0;
                }

                dt {
                  float: left;
                  width: 54px;
                  line-height: 22px;
                  text-align: right;
                  padding: 3px 6px 0 0;
                  font-weight: 700;
                }

                dd {
                  float: left;
                  width: 415px;
                  padding: 3px 0 0;
                  overflow: hidden;

                  em {
                    float: left;
                    height: 14px;
                    line-height: 14px;
                    padding: 0 8px;
                    margin-top: 5px;
                    border-left: 1px solid #ccc;
                  }
                }
              }
            }
          }

          &:hover {
            .item-list {
              display: block;
            }
          }
        }
      }
    }
    .sort-leave-to,
    .sort-enter {
      opacity: 0;
    }
    .sort-leave-active,
    .sort-enter-active {
      transition: all 0.3s ease;
    }
  }
}
.active {
  background-color: rgb(200, 200, 200);
}
a {
  cursor: pointer;
}
</style>
